Thought and Observations- Air leaks

Discussion in 'Instructions for Building and Repairing Motorized ' started by Bikeguy Joe, Jan 12, 2009.

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  1. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

    Jan 8, 2008
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    Here's a couple of thoughts about the common and dreaded air leak.

    This is not all of the possible causes, but two that may be over looked right off the bat when assembling the bicycle motor kit. Both are easily detectable, and easily fix before they cause you any problems.

    Look closely at photo 1. You will see two things.
    1. The "flat spot" where the carb top threads onto the carb.
    2. Those slots...some go deeper than others. The face of the carb hits the end of the manifiold, and the slots leave little holes where air is sucked in.

    (For no. 1.) Use a little RTV in the carb top and let it dry before screwing on the carb, or make a gasket to put in the top so when you screw it down, it will seal. I have seen them with little or no flat spot, if you get a carb like that, consider yourself lucky and blessed!

    (For no. 2.) I have used a belt sander and/or a file to grind down the face enough so when the carb is mounted, it will seal against the manifold. Some people use an "O" ring in there...I prefer the grinding/filing method.

    For either, use a little RTV or Rector Seal (removeable sealant used on gas pipe fittings) to goober up the top of the carb, or the manifold to carb area.

    Let it dry before use.

    Thanks for listening,

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    #1 Bikeguy Joe, Jan 12, 2009
    Last edited: Jan 12, 2009
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